First Build attempt, and looking for advise/suggestions

This is my first attempt at a build. I am more of a casual gamer, but do not want to be too underpowered. I am planning on savaging my optical drives and my Soundblaster card form my 2006 Dell XPS 410 that died (Unless someone can tell me why I would be better buying new ones). My thoughts are using a SSD for my OS and a few of my MMO games and the HDD for data, media and other games.
I am trying to keep it close to $100 budget-wise if I can. but want it last more than a few years as well. Any advise is appreciated. *forum will not let me post links yet

I would switch out the Seagate for a Western Digital is all I can think of looking at this. I have had several Seagates from friends machines including a couple I had before go bad. Never had a Western Digital fail on me though. Also if you are willing to forgo all the fear I would say go Windows 8 pro you can get the download version right from Microsoft for 40$ if you want to save the money. Windows 8 link here

I would switch out the Seagate for a Western Digital is all I can think of looking at this. I have had several Seagates from friends machines including a couple I had before go bad. Never had a Western Digital fail on me though. Also if you are willing to forgo all the fear I would say go Windows 8 pro you can get the download version right from Microsoft for 40$ if you want to save the money. Windows 8 link here

QFT, unless you use seagates enterprise line($$$ and you need a server motherboard because they are SAS drives, or a sata back plane, also $$$), go with western digital as their controllers on the HDD are just of a far higher quality than the seagate ones.

Well I haven't had any experience with MSI boards but one thing I have to admit is the PCB they use is brilliant. Everything is so solid and so flat & straight and the pins are not sticking 5meters out like Asus boards. I wished Asus would do this. Asus really uses weak PCB.

Gigabyte/Asus/MSI/Asrock all are making decent reliable boards but still you want a bugfree bios and good support from the brand which is a factor as well.

I don't see anything wrong in your build but why would you use a PSU of 750W? Seagate hdd switch this one out to a WD blue/black. My Seagate is like 3 months old and has already errors in a smart scan >.<

A lovely seasonic 500-600W should be lovely in it's place. A 650W should be able to sli a gtx 660 if you plan to sli it.

Don't switch the i5 3570k for a 2500k, you're not going to be an extreme overclocker so.

You don't require a third-party CPU cooler for i5/i7 chips unless you intend to REALLY stress them (which is pointless unless you just want to score big on overclocking forums). Granted, they might look a little sexier than the standard Intel cooler, but it's unnecessary expense.

You don't require a third-party CPU cooler for i5/i7 chips unless you intend to REALLY stress them (which is pointless unless you just want to score big on overclocking forums). Granted, they might look a little sexier than the standard Intel cooler, but it's unnecessary expense.

Less noise
Overclocking does increase performance in games, so no. Not pointsless.

Less noise
Overclocking does increase performance in games, so no. Not pointsless.

You actually need a 3rd party cooler IF you make use of the Asus Turbo profile in the bios. This sets the CPU automatically at 4.2GHz with 1.25Vcore (motherboard auto overvolts) and the stock cooler is not going to hold it. If he starts to manually tweak the overclock for 4.2GHz with 1.1Vcore he doesn't need a 3rd party cooler.

Win8 boot times are incredible, huge improvement over Win7 in that regard. I'm getting sub 3 second boot times with a Corsair 240GB SSD and Win8.

Seems to run the few games I play better than Win7, FPS increase of a few percent all around. Only downsides I have come across are a few navigational quirks in the OS; but I'm pretty sure you can mod that stuff to Win7 mode with an addon if you really can't get used to it.